/* * Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * The contents of this file constitute Original Code as defined in and * are subject to the Apple Public Source License Version 1.1 (the * "License"). You may not use this file except in compliance with the * License. Please obtain a copy of the License at * http://www.apple.com/publicsource and read it before using this file. * * This Original Code and all software distributed under the License are * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the * License for the specific language governing rights and limitations * under the License. * * @APPLE_LICENSE_HEADER_END@ */ /* * Copyright (c) 1998 Apple Computer, Inc. All rights reserved. * * HISTORY * */ /* * Multiprocessor locks used within the shared memory area between the * kernel and event system. These must work in both user and kernel mode. * * These routines are public, for the purpose of writing frame buffer device * drivers which handle their own cursors. Certain architectures define a * generic display class which handles cursor drawing and is subclassed by * driver writers. These drivers need not be concerned with the following * types and definitions. * * The ev_lock(), ev_unlock(), and ev_try_lock() functions are available only * to drivers built in or dynamically loaded into the kernel, and to DPS * drivers built in or dynamically loaded into the Window Server. They do not * exist in any shared library. * * --> They're now in IOKit user lib. */ #ifndef _IOKIT_IOSHAREDLOCK_H #define _IOKIT_IOSHAREDLOCK_H #ifdef __cplusplus extern "C" { #endif // should be 32 bytes on PPC typedef volatile int IOSharedLockData; typedef IOSharedLockData * IOSharedLock; #define IOSpinLockInit(l) (*(l) = (IOSpinLockData)0) extern void IOSpinLock(IOSharedLock l); extern void IOSpinUnlock(IOSharedLock l); extern boolean_t IOTrySpinLock(IOSharedLock l); /* exact same stuff & implementation */ typedef IOSharedLockData ev_lock_data_t; typedef ev_lock_data_t * ev_lock_t; #define ev_init_lock(l) (*(l) = (ev_lock_data_t)0) // needs isync? //#define ev_is_locked(l) (*(l) != (ev_lock_data_t)0) extern void ev_lock(ev_lock_t l); // Spin lock! extern void ev_unlock(ev_lock_t l); extern boolean_t ev_try_lock(ev_lock_t l); #ifdef __cplusplus } #endif #endif /* ! _IOKIT_IOSHAREDLOCK_H */